Slice
potatoes thinly lengthwise - about 0.5cm thick. Arrange in a single layer
on a lightly greased pizza tray. Spread tomato paste over potato slices. Spread
ricotta cheese over. Top with the remaining ingredients, finishing with
the Parmesan. Bake in a hot oven (200oC) for 30 minutes, or
microwave on high for 10-12 minutes